By default, RadGrid does not apply a filter until the user clicks on the filter button and selects a filter function.

If you set AutoPostBackOnFilter property of a column to True, the user does not need to press the filter button to initiate filtering. Instead, a postback filter operation occurs when the user types a filter in the filter box and presses [Enter] from the keyboard or if the filter textbox loses focus.

When AutoPostBackOnFilter is True, the column assumes a filter operation of Contains for string types or EqualTo for numeric types. You can change this to another filter function by setting the CurrentFilterFunction property. For example:

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